Featured articles are displayed here, which represent some of the best content on English Wikipedia.
Image 1
Pale crag martin flying in the Eastern Desert, Southern Egypt.
The pale crag martin (Ptyonoprogne obsoleta) is a small passerinebird in the swallow family that is resident in Northern Africa and in Southwestern Asia, east to Pakistan. It breeds mainly in the mountains, but also at lower altitudes, especially in rocky areas and around towns. Unlike most swallows, it is often found far from water. It is 12–13 cm (4+1⁄2–5 in) long, with mainly brown plumage, paler-toned on the upper breast and underwing coverts, and with white "windows" on the spread tail in flight. The sexes are similar in appearance, but juveniles have pale fringes to the upperparts and flight feathers. It was formerly considered to be the northern subspecies of the rock martin of southern Africa, although it is smaller, paler, and whiter-throated than that species. The pale crag martin hunts along cliff faces for flying insects using a slow flight with much gliding. Its call is a soft twitter. (Full article...)
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The bog turtle (Glyptemys muhlenbergii) is a critically endangered species of semiaquatic turtle in the familyEmydidae. The species is endemic to the eastern United States. It was first scientifically described in 1801 after an 18th-century survey of Pennsylvania. The smallest North American turtle, its carapace measures about 10 centimeters (4 in) long when fully grown. Although the bog turtle is similar in appearance to the painted or spotted turtles, its closest relative is actually the somewhat larger wood turtle. The bog turtle can be found from Vermont in the north, south to Georgia, and west to Pennsylvania. Diurnal and secretive, it spends most of its time buried in mud and – during the winter months – in hibernation. The bog turtle is omnivorous, feeding mainly on small invertebrates. The bog turtle is the state reptile of New Jersey. (Full article...)
Two reconstructed S. validum skeletons based on specimen UALVP 2, Royal Tyrrell Museum
Stegoceras is a genus of pachycephalosaurid (dome-headed) dinosaur that lived in what is now North America during the Late Cretaceousperiod, about 77.5 to 74 million years ago (mya). The first specimens from Alberta, Canada, were described in 1902, and the type speciesStegoceras validum was based on these remains. The generic name means "horn roof", and the specific name means "strong". Several other species have been placed in the genus over the years, but these have since been moved to other genera or deemed junior synonyms. Currently only S. validum and S. novomexicanum, named in 2011 from fossils found in New Mexico, remain. The validity of the latter species has also been debated, and it may not even belong to the genus Stegoceras. (Full article...)
The raccoon (/rəˈkuːn/ or US: /ræˈkuːn/ⓘ, Procyon lotor), sometimes called the North American, northern or common raccoon (also spelled racoon) to distinguish it from other species of raccoon, is a mammal native to North America. It is the largest of the procyonid family, having a body length of 40 to 70 cm (16 to 28 in), and a body weight of 5 to 26 kg (11 to 57 lb). Its grayish coat mostly consists of dense underfur, which insulates it against cold weather. The animal's most distinctive features include its extremely dexterous front paws, its facial mask, and its ringed tail, which are common themes in the mythologies of the Indigenous peoples of the Americas surrounding the species. The raccoon is noted for its intelligence, and studies show that it is able to remember the solution to tasks for at least three years. It is usually nocturnal and omnivorous, eating about 40% invertebrates, 33% plants, and 27% vertebrates. (Full article...)
Pipistrellus raceyi, also known as Racey's pipistrelle, is a bat from Madagascar, in the genus Pipistrellus. Although unidentified species of Pipistrellus had been previously reported from Madagascar since the 1990s, P. raceyi was not formally named until 2006. It is apparently most closely related to the Asian species P. endoi, P. paterculus, and P. abramus, and its ancestors probably reached Madagascar from Asia. P. raceyi has been recorded at four sites, two in the eastern and two in the western lowlands. In the east, it is found in open areas and has been found roosting in a building; in the west it occurs in dry forest. Because of uncertainties about its ecology, it is listed as "Data Deficient" on the IUCN Red List. (Full article...)
Terns are seabirds in the familyLaridae, subfamily Sterninae, that have a worldwide distribution and are normally found near the sea, rivers, or wetlands. Terns are treated in eleven genera in a subgroup of the family Laridae, which also includes several genera of gulls and the skimmers (Rynchops). They are slender, lightly built birds with long, forked tails, narrow wings, long bills, and relatively short legs. Most species are pale grey above and white below with a contrasting black cap to the head, but the marsh terns, the black-bellied tern, the Inca tern, and some noddies have dark body plumage for at least part of the year. The sexes are identical in appearance, but young birds are readily distinguishable from adults. Terns have a non-breeding plumage, which usually involves a white forehead and much-reduced black cap. (Full article...)
Stela 51 from Calakmul, dating to 731, is the best preserved monument from the city. It depicts the king Yuknoom Tookʼ Kʼawiil.
Maya stelae (singular stela) are monuments that were fashioned by the Maya civilization of ancient Mesoamerica. They consist of tall, sculpted stone shafts and are often associated with low circular stones referred to as altars, although their actual function is uncertain. Many stelae were sculpted in low relief, although plain monuments are found throughout the Maya region. The sculpting of these monuments spread throughout the Maya area during the Classic Period (250-900 AD), and these pairings of sculpted stelae and circular altars are considered a hallmark of Classic Maya civilization. The earliest dated stela to have been found in situ in the Maya lowlands was recovered from the great city of Tikal in Guatemala. During the Classic Period almost every Maya kingdom in the southern lowlands raised stelae in its ceremonial centre. (Full article...)
Deinosuchus (/ˌdaɪnəˈsjuːkəs/), from Ancient Greek δεινός (deinós), meaning "terrible", and σούχος (soúkhos), meaning "crocodile". is an extinctgenus of alligatoroidcrocodilian, related to modern alligators and caimans, that lived 82 to 73 million years ago (Ma), during the late Cretaceousperiod. The first remains were discovered in North Carolina (United States) in the 1850s; the genus was named and described in 1909. Additional fragments were discovered in the 1940s and were later incorporated into an influential, though inaccurate, skull reconstruction at the American Museum of Natural History. Knowledge of Deinosuchus remains incomplete, but better cranial material found in recent years has expanded scientific understanding of this massive predator. (Full article...)
The antbirds are a large passerine bird family, Thamnophilidae, found across subtropical and tropical Central and South America, from Mexico to Argentina. There are more than 230 species, known variously as antshrikes, antwrens, antvireos, fire-eyes, bare-eyes and bushbirds. They are related to the antthrushes and antpittas (family Formicariidae), the tapaculos, the gnateaters and the ovenbirds. Despite some species' common names, this family is not closely related to the wrens, vireos or shrikes. (Full article...)
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♄ Saturn is the sixth planet from the Sun and the second largest in the Solar System, after Jupiter. It is a gas giant, with an average radius of about nine times that of Earth. It has an eighth the average density of Earth, but is over 95 times more massive. Even though Saturn is almost as big as Jupiter, Saturn has less than a third its mass. Saturn orbits the Sun at a distance of 9.59 AU (1,434 million km), with an orbital period of 29.45 years. (Full article...)
... that Science Park station was built despite the objections of the operating agency?
... that several science fiction critics praised "Rock Diver", the first short story by American writer Harry Harrison, for its compelling take on technology for passing through matter?
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A plot of normal distribution (or bell-shaped curve) where each band has a width of 1 standard deviation – See also: 68–95–99.7 rule. In statistics, the standard deviation is a measure of the amount of variation of the values of a variable about its mean. A low standard deviation indicates that the values tend to be close to the mean (also called the expected value) of the set, while a high standard deviation indicates that the values are spread out over a wider range. The standard deviation is commonly used in the determination of what constitutes an outlier and what does not. Standard deviation may be abbreviated SD or std dev, and is most commonly represented in mathematical texts and equations by the lowercase Greek letterσ (sigma), for the population standard deviation, or the Latin letters, for the sample standard deviation. (Full article...)
Sci-Hub is a library website that provides free access to millions of research papers, regardless of copyright, by bypassing publishers' paywalls in various ways. Unlike Library Genesis, it does not provide access to books. Sci-Hub was founded in Kazakhstan by Alexandra Elbakyan in 2011, in response to the high cost of research papers behind paywalls (see Serials crisis). The site is extensively used worldwide. In September 2019, the site's operator(s) said that it served approximately 400,000 requests per day. In addition to its intensive use, Sci-Hub stands out among other shadow libraries because of its easy use/reliability and because of the enormous size of its collection; a 2018 study estimated that Sci-Hub provided access to most of the scholarly publications with issued DOI numbers. On 15 July 2022, Sci-Hub reported that its collection comprised 88,343,822 files. Since December 2020, the site has paused uploads due to legal troubles. (Full article...)
Featured articles are displayed here, which represent some of the best content on English Wikipedia.
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Projectile motion of a bouncing ball at Inelastic collision, by MichaelMaggs (from Wikipedia:Featured pictures/Sciences/Others)
Animation of a water drop, by Chris 73 and Gmaxwell (from Wikipedia:Featured pictures/Sciences/Others)
Translational motion at Thermodynamic temperature, by Greg L (from Wikipedia:Featured pictures/Sciences/Others)
Parallax, by Mila Zinkova (edited by Richard Bartz) (from Wikipedia:Featured pictures/Sciences/Others)
Archaeological excavation at Atapuerca Mountains, by Mario modesto (from Wikipedia:Featured pictures/Sciences/Others)
Mechanical advantage device, by Prolineserver (edited by Tomia, Ss181292 and Atropos235) (from Wikipedia:Featured pictures/Sciences/Others)
Global oceanic and terrestrial photoautotroph abundance at Primary production, by SeaWiFS Project (from Wikipedia:Featured pictures/Sciences/Others)
Toroid magnets of the ATLAS detector, by Maximilien Brice, CERN (edited by Bammesk) (from Wikipedia:Featured pictures/Sciences/Others)
Archaeologists prospecting Santa Ana Cave at Excavation (archaeology), by Mario modesto (from Wikipedia:Featured pictures/Sciences/Others)
Drop impact on a liquid surface, by José Manuel Suárez (from Wikipedia:Featured pictures/Sciences/Others)
Vibrating glass beam at Euler–Bernoulli beam theory, by Ben pcc (from Wikipedia:Featured pictures/Sciences/Others)
Peruvian Andes at United States Exploring Expedition, by Alfred Thomas Agate (edited by Durova) (from Wikipedia:Featured pictures/Sciences/Others)
Nobel Prize in Physics diploma, by Sofia Gisberg (restored by Jebulon) (from Wikipedia:Featured pictures/Sciences/Others)
Section of the Large Hadron Collider, by Maximilien Brice (from Wikipedia:Featured pictures/Sciences/Others)
Color cathodoluminescence of a diamond, by Pavel.Somov (from Wikipedia:Featured pictures/Sciences/Others)
Simulation of liquids with different viscosities, by Synapticrelay (from Wikipedia:Featured pictures/Sciences/Others)
NASA study on wingtip vortices at Wake turbulence, by Langley Research Center (edited by Fir0002) (from Wikipedia:Featured pictures/Sciences/Others)
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Vital articles to understand Science.
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